GAIL SALTZ, M.D., a clinical associate professor of psychiatry at Weill-Cornell School of Medicine, is a regular contributor for the Today show and O magazine. Dr. Saltz lives and works in New York City.

We think we know those who are close to us, and we want to believe that what we see is what we get. But we can never know for certain, because what really goes on inside another's head and heart is essentially a secret. How do you know if that secret is something that will hurt you?
Your husband turns to face you in bed. Is he thinking about you or your closest friend?
Your boss shows up in another new outfit. Did she get a raise or is she a compulsive shopper who is stealing money from the company?
Your teenaged daughter is upstairs in her bedroom. Is she doing her homework or chatting online with a man twice her age?
Anatomy of A Secret Life will take you inside the minds of secret-keepers and show you how secrets start, how they're kept, and how they exact their devastating emotional and social toll. Using contemporary case studies and historical examples, Dr. Gail Saltz shows you how to spot—through subtle behaviors and clues—and safely stop the potentially dangerous secrets that someone, even you, might be concealing from the world.